heads_up_display_layer_impl.cc revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
1// Copyright 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "cc/layers/heads_up_display_layer_impl.h"
6
7#include "base/stringprintf.h"
8#include "base/strings/string_split.h"
9#include "cc/debug/debug_colors.h"
10#include "cc/debug/debug_rect_history.h"
11#include "cc/debug/frame_rate_counter.h"
12#include "cc/debug/paint_time_counter.h"
13#include "cc/layers/quad_sink.h"
14#include "cc/output/renderer.h"
15#include "cc/quads/texture_draw_quad.h"
16#include "cc/resources/memory_history.h"
17#include "cc/resources/tile_manager.h"
18#include "cc/trees/layer_tree_impl.h"
19#include "skia/ext/platform_canvas.h"
20#include "skia/ext/platform_canvas.h"
21#include "third_party/khronos/GLES2/gl2.h"
22#include "third_party/khronos/GLES2/gl2ext.h"
23#include "third_party/skia/include/core/SkBitmap.h"
24#include "third_party/skia/include/core/SkPaint.h"
25#include "third_party/skia/include/core/SkTypeface.h"
26#include "third_party/skia/include/effects/SkColorMatrixFilter.h"
27#include "ui/gfx/point.h"
28#include "ui/gfx/size.h"
29
30namespace cc {
31
32static inline SkPaint CreatePaint() {
33  SkPaint paint;
34#if (SK_R32_SHIFT || SK_B32_SHIFT != 16)
35  // The SkCanvas is in RGBA but the shader is expecting BGRA, so we need to
36  // swizzle our colors when drawing to the SkCanvas.
37  SkColorMatrix swizzle_matrix;
38  for (int i = 0; i < 20; ++i)
39    swizzle_matrix.fMat[i] = 0;
40  swizzle_matrix.fMat[0 + 5 * 2] = 1;
41  swizzle_matrix.fMat[1 + 5 * 1] = 1;
42  swizzle_matrix.fMat[2 + 5 * 0] = 1;
43  swizzle_matrix.fMat[3 + 5 * 3] = 1;
44
45  skia::RefPtr<SkColorMatrixFilter> filter =
46      skia::AdoptRef(new SkColorMatrixFilter(swizzle_matrix));
47  paint.setColorFilter(filter.get());
48#endif
49  return paint;
50}
51
52HeadsUpDisplayLayerImpl::Graph::Graph(double indicator_value,
53                                      double start_upper_bound)
54    : value(0.0),
55      min(0.0),
56      max(0.0),
57      current_upper_bound(start_upper_bound),
58      default_upper_bound(start_upper_bound),
59      indicator(indicator_value) {}
60
61double HeadsUpDisplayLayerImpl::Graph::UpdateUpperBound() {
62  double target_upper_bound = std::max(max, default_upper_bound);
63  current_upper_bound += (target_upper_bound - current_upper_bound) * 0.5;
64  return current_upper_bound;
65}
66
67HeadsUpDisplayLayerImpl::HeadsUpDisplayLayerImpl(LayerTreeImpl* tree_impl,
68                                                 int id)
69    : LayerImpl(tree_impl, id),
70      fps_graph_(60.0, 80.0),
71      paint_time_graph_(16.0, 48.0),
72      typeface_(skia::AdoptRef(
73          SkTypeface::CreateFromName("monospace", SkTypeface::kBold))) {}
74
75HeadsUpDisplayLayerImpl::~HeadsUpDisplayLayerImpl() {}
76
77scoped_ptr<LayerImpl> HeadsUpDisplayLayerImpl::CreateLayerImpl(
78    LayerTreeImpl* tree_impl) {
79  return HeadsUpDisplayLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
80}
81
82void HeadsUpDisplayLayerImpl::WillDraw(ResourceProvider* resource_provider) {
83  LayerImpl::WillDraw(resource_provider);
84
85  if (!hud_texture_)
86    hud_texture_ = ScopedResource::create(resource_provider);
87
88  // TODO(danakj): Scale the HUD by device scale to make it more friendly under
89  // high DPI.
90
91  // TODO(danakj): The HUD could swap between two textures instead of creating a
92  // texture every frame in ubercompositor.
93  if (hud_texture_->size() != bounds() ||
94      resource_provider->InUseByConsumer(hud_texture_->id()))
95    hud_texture_->Free();
96
97  if (!hud_texture_->id()) {
98    hud_texture_->Allocate(
99        bounds(), GL_RGBA, ResourceProvider::TextureUsageAny);
100    // TODO(epenner): This texture was being used before SetPixels was called,
101    // which is now not allowed (it's an uninitialized read). This should be
102    // fixed and this allocateForTesting() removed.
103    // http://crbug.com/166784
104    resource_provider->AllocateForTesting(hud_texture_->id());
105  }
106}
107
108void HeadsUpDisplayLayerImpl::AppendQuads(QuadSink* quad_sink,
109                                          AppendQuadsData* append_quads_data) {
110  if (!hud_texture_->id())
111    return;
112
113  SharedQuadState* shared_quad_state =
114      quad_sink->UseSharedQuadState(CreateSharedQuadState());
115
116  gfx::Rect quad_rect(bounds());
117  gfx::Rect opaque_rect(contents_opaque() ? quad_rect : gfx::Rect());
118  bool premultiplied_alpha = true;
119  gfx::PointF uv_top_left(0.f, 0.f);
120  gfx::PointF uv_bottom_right(1.f, 1.f);
121  const float vertex_opacity[] = { 1.f, 1.f, 1.f, 1.f };
122  bool flipped = false;
123  scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
124  quad->SetNew(shared_quad_state,
125               quad_rect,
126               opaque_rect,
127               hud_texture_->id(),
128               premultiplied_alpha,
129               uv_top_left,
130               uv_bottom_right,
131               vertex_opacity,
132               flipped);
133  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
134}
135
136void HeadsUpDisplayLayerImpl::UpdateHudTexture(
137    ResourceProvider* resource_provider) {
138  if (!hud_texture_->id())
139    return;
140
141  SkISize canvas_size;
142  if (hud_canvas_)
143    canvas_size = hud_canvas_->getDeviceSize();
144  else
145    canvas_size.set(0, 0);
146
147  if (canvas_size.fWidth != bounds().width() ||
148      canvas_size.fHeight != bounds().height() || !hud_canvas_) {
149    bool opaque = false;
150    hud_canvas_ = make_scoped_ptr(
151        skia::CreateBitmapCanvas(bounds().width(), bounds().height(), opaque));
152  }
153
154  UpdateHudContents();
155
156  hud_canvas_->clear(SkColorSetARGB(0, 0, 0, 0));
157  DrawHudContents(hud_canvas_.get());
158
159  const SkBitmap* bitmap = &hud_canvas_->getDevice()->accessBitmap(false);
160  SkAutoLockPixels locker(*bitmap);
161
162  gfx::Rect layer_rect(bounds());
163  DCHECK(bitmap->config() == SkBitmap::kARGB_8888_Config);
164  resource_provider->SetPixels(hud_texture_->id(),
165                               static_cast<const uint8_t*>(bitmap->getPixels()),
166                               layer_rect,
167                               layer_rect,
168                               gfx::Vector2d());
169}
170
171void HeadsUpDisplayLayerImpl::DidDraw(ResourceProvider* resource_provider) {
172  LayerImpl::DidDraw(resource_provider);
173
174  if (!hud_texture_->id())
175    return;
176
177  // FIXME: the following assert will not be true when sending resources to a
178  // parent compositor. We will probably need to hold on to hud_texture_ for
179  // longer, and have several HUD textures in the pipeline.
180  DCHECK(!resource_provider->InUseByConsumer(hud_texture_->id()));
181}
182
183void HeadsUpDisplayLayerImpl::DidLoseOutputSurface() { hud_texture_.reset(); }
184
185bool HeadsUpDisplayLayerImpl::LayerIsAlwaysDamaged() const { return true; }
186
187void HeadsUpDisplayLayerImpl::UpdateHudContents() {
188  const LayerTreeDebugState& debug_state = layer_tree_impl()->debug_state();
189
190  // Don't update numbers every frame so text is readable.
191  base::TimeTicks now = layer_tree_impl()->CurrentFrameTime();
192  if (base::TimeDelta(now - time_of_last_graph_update_).InSecondsF() > 0.25f) {
193    time_of_last_graph_update_ = now;
194
195    if (debug_state.show_fps_counter) {
196      FrameRateCounter* fps_counter = layer_tree_impl()->frame_rate_counter();
197      fps_graph_.value = fps_counter->GetAverageFPS();
198      fps_counter->GetMinAndMaxFPS(&fps_graph_.min, &fps_graph_.max);
199    }
200
201    if (debug_state.continuous_painting) {
202      PaintTimeCounter* paint_time_counter =
203          layer_tree_impl()->paint_time_counter();
204      base::TimeDelta latest, min, max;
205
206      if (paint_time_counter->End())
207        latest = paint_time_counter->End()->total_time();
208      paint_time_counter->GetMinAndMaxPaintTime(&min, &max);
209
210      paint_time_graph_.value = latest.InMillisecondsF();
211      paint_time_graph_.min = min.InMillisecondsF();
212      paint_time_graph_.max = max.InMillisecondsF();
213    }
214
215    if (debug_state.ShowMemoryStats()) {
216      MemoryHistory* memory_history = layer_tree_impl()->memory_history();
217      if (memory_history->End())
218        memory_entry_ = **memory_history->End();
219      else
220        memory_entry_ = MemoryHistory::Entry();
221    }
222  }
223
224  fps_graph_.UpdateUpperBound();
225  paint_time_graph_.UpdateUpperBound();
226}
227
228void HeadsUpDisplayLayerImpl::DrawHudContents(SkCanvas* canvas) const {
229  const LayerTreeDebugState& debug_state = layer_tree_impl()->debug_state();
230
231  if (debug_state.ShowHudRects())
232    DrawDebugRects(canvas, layer_tree_impl()->debug_rect_history());
233
234  if (debug_state.show_platform_layer_tree)
235    DrawPlatformLayerTree(canvas);
236
237  SkRect area = SkRect::MakeEmpty();
238  if (debug_state.continuous_painting) {
239    // Don't show the FPS display when continuous painting is enabled, because
240    // it would show misleading numbers.
241    area = DrawPaintTimeDisplay(
242        canvas, layer_tree_impl()->paint_time_counter(), 0, 0);
243  } else if (debug_state.show_fps_counter) {
244    area =
245        DrawFPSDisplay(canvas, layer_tree_impl()->frame_rate_counter(), 0, 0);
246  }
247
248  if (debug_state.ShowMemoryStats())
249    DrawMemoryDisplay(canvas, 0, area.bottom(), SkMaxScalar(area.width(), 150));
250}
251
252void HeadsUpDisplayLayerImpl::DrawText(SkCanvas* canvas,
253                                       SkPaint* paint,
254                                       const std::string& text,
255                                       SkPaint::Align align,
256                                       int size,
257                                       int x,
258                                       int y) const {
259  const bool anti_alias = paint->isAntiAlias();
260  paint->setAntiAlias(true);
261
262  paint->setTextSize(size);
263  paint->setTextAlign(align);
264  paint->setTypeface(typeface_.get());
265  canvas->drawText(text.c_str(), text.length(), x, y, *paint);
266
267  paint->setAntiAlias(anti_alias);
268}
269
270void HeadsUpDisplayLayerImpl::DrawText(SkCanvas* canvas,
271                                       SkPaint* paint,
272                                       const std::string& text,
273                                       SkPaint::Align align,
274                                       int size,
275                                       const SkPoint& pos) const {
276  DrawText(canvas, paint, text, align, size, pos.x(), pos.y());
277}
278
279void HeadsUpDisplayLayerImpl::DrawGraphBackground(SkCanvas* canvas,
280                                                  SkPaint* paint,
281                                                  const SkRect& bounds) const {
282  paint->setColor(DebugColors::HUDBackgroundColor());
283  canvas->drawRect(bounds, *paint);
284}
285
286void HeadsUpDisplayLayerImpl::DrawGraphLines(SkCanvas* canvas,
287                                             SkPaint* paint,
288                                             const SkRect& bounds,
289                                             const Graph& graph) const {
290  // Draw top and bottom line.
291  paint->setColor(DebugColors::HUDSeparatorLineColor());
292  canvas->drawLine(bounds.left(),
293                   bounds.top() - 1,
294                   bounds.right(),
295                   bounds.top() - 1,
296                   *paint);
297  canvas->drawLine(
298      bounds.left(), bounds.bottom(), bounds.right(), bounds.bottom(), *paint);
299
300  // Draw indicator line (additive blend mode to increase contrast when drawn on
301  // top of graph).
302  paint->setColor(DebugColors::HUDIndicatorLineColor());
303  paint->setXfermodeMode(SkXfermode::kPlus_Mode);
304  const double indicator_top =
305      bounds.height() * (1.0 - graph.indicator / graph.current_upper_bound) -
306      1.0;
307  canvas->drawLine(bounds.left(),
308                   bounds.top() + indicator_top,
309                   bounds.right(),
310                   bounds.top() + indicator_top,
311                   *paint);
312  paint->setXfermode(NULL);
313}
314
315void HeadsUpDisplayLayerImpl::DrawPlatformLayerTree(SkCanvas* canvas) const {
316  const int kFontHeight = 14;
317  SkPaint paint = CreatePaint();
318  DrawGraphBackground(
319      canvas,
320      &paint,
321      SkRect::MakeXYWH(0, 0, bounds().width(), bounds().height()));
322
323  std::string layer_tree = layer_tree_impl()->layer_tree_as_text();
324  std::vector<std::string> lines;
325  base::SplitString(layer_tree, '\n', &lines);
326
327  paint.setColor(DebugColors::PlatformLayerTreeTextColor());
328  for (size_t i = 0;
329       i < lines.size() &&
330           static_cast<int>(2 + i * kFontHeight) < bounds().height();
331       ++i) {
332    DrawText(canvas,
333             &paint,
334             lines[i],
335             SkPaint::kLeft_Align,
336             kFontHeight,
337             2,
338             2 + (i + 1) * kFontHeight);
339  }
340}
341
342SkRect HeadsUpDisplayLayerImpl::DrawFPSDisplay(
343    SkCanvas* canvas,
344    const FrameRateCounter* fps_counter,
345    int right,
346    int top) const {
347  const int kPadding = 4;
348  const int kGap = 6;
349
350  const int kFontHeight = 15;
351
352  const int kGraphWidth = fps_counter->time_stamp_history_size() - 2;
353  const int kGraphHeight = 40;
354
355  const int kHistogramWidth = 37;
356
357  int width = kGraphWidth + kHistogramWidth + 4 * kPadding;
358  int height = kFontHeight + kGraphHeight + 4 * kPadding + 2;
359  int left = bounds().width() - width - right;
360  SkRect area = SkRect::MakeXYWH(left, top, width, height);
361
362  SkPaint paint = CreatePaint();
363  DrawGraphBackground(canvas, &paint, area);
364
365  SkRect text_bounds =
366      SkRect::MakeXYWH(left + kPadding,
367                       top + kPadding,
368                       kGraphWidth + kHistogramWidth + kGap + 2,
369                       kFontHeight);
370  SkRect graph_bounds = SkRect::MakeXYWH(left + kPadding,
371                                         text_bounds.bottom() + 2 * kPadding,
372                                         kGraphWidth,
373                                         kGraphHeight);
374  SkRect histogram_bounds = SkRect::MakeXYWH(graph_bounds.right() + kGap,
375                                             graph_bounds.top(),
376                                             kHistogramWidth,
377                                             kGraphHeight);
378
379  const std::string value_text =
380      base::StringPrintf("FPS:%5.1f", fps_graph_.value);
381  const std::string min_max_text =
382      base::StringPrintf("%.0f-%.0f", fps_graph_.min, fps_graph_.max);
383
384  paint.setColor(DebugColors::FPSDisplayTextAndGraphColor());
385  DrawText(canvas,
386           &paint,
387           value_text,
388           SkPaint::kLeft_Align,
389           kFontHeight,
390           text_bounds.left(),
391           text_bounds.bottom());
392  DrawText(canvas,
393           &paint,
394           min_max_text,
395           SkPaint::kRight_Align,
396           kFontHeight,
397           text_bounds.right(),
398           text_bounds.bottom());
399
400  DrawGraphLines(canvas, &paint, graph_bounds, fps_graph_);
401
402  // Collect graph and histogram data.
403  SkPath path;
404
405  const int kHistogramSize = 20;
406  double histogram[kHistogramSize] = { 1.0 };
407  double max_bucket_value = 1.0;
408
409  for (FrameRateCounter::RingBufferType::Iterator it = --fps_counter->end(); it;
410       --it) {
411    base::TimeDelta delta = fps_counter->RecentFrameInterval(it.index() + 1);
412
413    // Skip this particular instantaneous frame rate if it is not likely to have
414    // been valid.
415    if (!fps_counter->IsBadFrameInterval(delta)) {
416      double fps = 1.0 / delta.InSecondsF();
417
418      // Clamp the FPS to the range we want to plot visually.
419      double p = fps / fps_graph_.current_upper_bound;
420      if (p > 1.0)
421        p = 1.0;
422
423      // Plot this data point.
424      SkPoint cur =
425          SkPoint::Make(graph_bounds.left() + it.index(),
426                        graph_bounds.bottom() - p * graph_bounds.height());
427      if (path.isEmpty())
428        path.moveTo(cur);
429      else
430        path.lineTo(cur);
431
432      // Use the fps value to find the right bucket in the histogram.
433      int bucket_index = floor(p * (kHistogramSize - 1));
434
435      // Add the delta time to take the time spent at that fps rate into
436      // account.
437      histogram[bucket_index] += delta.InSecondsF();
438      max_bucket_value = std::max(histogram[bucket_index], max_bucket_value);
439    }
440  }
441
442  // Draw FPS histogram.
443  paint.setColor(DebugColors::HUDSeparatorLineColor());
444  canvas->drawLine(histogram_bounds.left() - 1,
445                   histogram_bounds.top() - 1,
446                   histogram_bounds.left() - 1,
447                   histogram_bounds.bottom() + 1,
448                   paint);
449  canvas->drawLine(histogram_bounds.right() + 1,
450                   histogram_bounds.top() - 1,
451                   histogram_bounds.right() + 1,
452                   histogram_bounds.bottom() + 1,
453                   paint);
454
455  paint.setColor(DebugColors::FPSDisplayTextAndGraphColor());
456  const double bar_height = histogram_bounds.height() / kHistogramSize;
457
458  for (int i = kHistogramSize - 1; i >= 0; --i) {
459    if (histogram[i] > 0) {
460      double bar_width =
461          histogram[i] / max_bucket_value * histogram_bounds.width();
462      canvas->drawRect(
463          SkRect::MakeXYWH(histogram_bounds.left(),
464                           histogram_bounds.bottom() - (i + 1) * bar_height,
465                           bar_width,
466                           1),
467          paint);
468    }
469  }
470
471  // Draw FPS graph.
472  paint.setAntiAlias(true);
473  paint.setStyle(SkPaint::kStroke_Style);
474  paint.setStrokeWidth(1);
475  canvas->drawPath(path, paint);
476
477  return area;
478}
479
480SkRect HeadsUpDisplayLayerImpl::DrawMemoryDisplay(SkCanvas* canvas,
481                                                  int right,
482                                                  int top,
483                                                  int width) const {
484  if (!memory_entry_.bytes_total())
485    return SkRect::MakeEmpty();
486
487  const int kPadding = 4;
488  const int kFontHeight = 13;
489
490  const int height = 3 * kFontHeight + 4 * kPadding;
491  const int left = bounds().width() - width - right;
492  const SkRect area = SkRect::MakeXYWH(left, top, width, height);
493
494  const double megabyte = 1024.0 * 1024.0;
495
496  SkPaint paint = CreatePaint();
497  DrawGraphBackground(canvas, &paint, area);
498
499  SkPoint title_pos = SkPoint::Make(left + kPadding, top + kFontHeight);
500  SkPoint stat1_pos = SkPoint::Make(left + width - kPadding - 1,
501                                    top + kPadding + 2 * kFontHeight);
502  SkPoint stat2_pos = SkPoint::Make(left + width - kPadding - 1,
503                                    top + 2 * kPadding + 3 * kFontHeight);
504
505  paint.setColor(DebugColors::MemoryDisplayTextColor());
506  DrawText(canvas,
507           &paint,
508           "GPU memory",
509           SkPaint::kLeft_Align,
510           kFontHeight,
511           title_pos);
512
513  std::string text =
514      base::StringPrintf("%6.1f MB used",
515                         (memory_entry_.bytes_unreleasable +
516                          memory_entry_.bytes_allocated) / megabyte);
517  DrawText(canvas, &paint, text, SkPaint::kRight_Align, kFontHeight, stat1_pos);
518
519  if (memory_entry_.bytes_over) {
520    paint.setColor(SK_ColorRED);
521    text = base::StringPrintf("%6.1f MB over",
522                              memory_entry_.bytes_over / megabyte);
523  } else {
524    text = base::StringPrintf("%6.1f MB max ",
525                              memory_entry_.total_budget_in_bytes / megabyte);
526  }
527  DrawText(canvas, &paint, text, SkPaint::kRight_Align, kFontHeight, stat2_pos);
528
529  return area;
530}
531
532SkRect HeadsUpDisplayLayerImpl::DrawPaintTimeDisplay(
533    SkCanvas* canvas,
534    const PaintTimeCounter* paint_time_counter,
535    int right,
536    int top) const {
537  const int kPadding = 4;
538  const int kFontHeight = 15;
539
540  const int kGraphWidth = paint_time_counter->HistorySize();
541  const int kGraphHeight = 40;
542
543  const int width = kGraphWidth + 2 * kPadding;
544  const int height =
545      kFontHeight + kGraphHeight + 4 * kPadding + 2 + kFontHeight + kPadding;
546  const int left = bounds().width() - width - right;
547
548  const SkRect area = SkRect::MakeXYWH(left, top, width, height);
549
550  SkPaint paint = CreatePaint();
551  DrawGraphBackground(canvas, &paint, area);
552
553  SkRect text_bounds = SkRect::MakeXYWH(
554      left + kPadding, top + kPadding, kGraphWidth, kFontHeight);
555  SkRect text_bounds2 = SkRect::MakeXYWH(left + kPadding,
556                                         text_bounds.bottom() + kPadding,
557                                         kGraphWidth,
558                                         kFontHeight);
559  SkRect graph_bounds = SkRect::MakeXYWH(left + kPadding,
560                                         text_bounds2.bottom() + 2 * kPadding,
561                                         kGraphWidth,
562                                         kGraphHeight);
563
564  const std::string value_text =
565      base::StringPrintf("%.1f", paint_time_graph_.value);
566  const std::string min_max_text = base::StringPrintf(
567      "%.1f-%.1f", paint_time_graph_.min, paint_time_graph_.max);
568
569  paint.setColor(DebugColors::PaintTimeDisplayTextAndGraphColor());
570  DrawText(canvas,
571           &paint,
572           "Page paint time (ms)",
573           SkPaint::kLeft_Align,
574           kFontHeight,
575           text_bounds.left(),
576           text_bounds.bottom());
577  DrawText(canvas,
578           &paint,
579           value_text,
580           SkPaint::kLeft_Align,
581           kFontHeight,
582           text_bounds2.left(),
583           text_bounds2.bottom());
584  DrawText(canvas,
585           &paint,
586           min_max_text,
587           SkPaint::kRight_Align,
588           kFontHeight,
589           text_bounds2.right(),
590           text_bounds2.bottom());
591
592  paint.setColor(DebugColors::PaintTimeDisplayTextAndGraphColor());
593  for (PaintTimeCounter::RingBufferType::Iterator it =
594           paint_time_counter->End();
595       it;
596       --it) {
597    double pt = it->total_time().InMillisecondsF();
598
599    if (pt == 0.0)
600      continue;
601
602    double p = pt / paint_time_graph_.current_upper_bound;
603    if (p > 1.0)
604      p = 1.0;
605
606    canvas->drawRect(
607        SkRect::MakeXYWH(graph_bounds.left() + it.index(),
608                         graph_bounds.bottom() - p * graph_bounds.height(),
609                         1,
610                         p * graph_bounds.height()),
611        paint);
612  }
613
614  DrawGraphLines(canvas, &paint, graph_bounds, paint_time_graph_);
615
616  return area;
617}
618
619void HeadsUpDisplayLayerImpl::DrawDebugRects(
620    SkCanvas* canvas,
621    DebugRectHistory* debug_rect_history) const {
622  const std::vector<DebugRect>& debug_rects = debug_rect_history->debug_rects();
623  float rect_scale = 1.f / layer_tree_impl()->device_scale_factor();
624  SkPaint paint = CreatePaint();
625
626  canvas->save();
627  canvas->scale(rect_scale, rect_scale);
628
629  for (size_t i = 0; i < debug_rects.size(); ++i) {
630    SkColor stroke_color = 0;
631    SkColor fill_color = 0;
632    float stroke_width = 0.f;
633
634    switch (debug_rects[i].type) {
635      case PAINT_RECT_TYPE:
636        stroke_color = DebugColors::PaintRectBorderColor();
637        fill_color = DebugColors::PaintRectFillColor();
638        stroke_width = DebugColors::PaintRectBorderWidth(layer_tree_impl());
639        break;
640      case PROPERTY_CHANGED_RECT_TYPE:
641        stroke_color = DebugColors::PropertyChangedRectBorderColor();
642        fill_color = DebugColors::PropertyChangedRectFillColor();
643        stroke_width =
644            DebugColors::PropertyChangedRectBorderWidth(layer_tree_impl());
645        break;
646      case SURFACE_DAMAGE_RECT_TYPE:
647        stroke_color = DebugColors::SurfaceDamageRectBorderColor();
648        fill_color = DebugColors::SurfaceDamageRectFillColor();
649        stroke_width =
650            DebugColors::SurfaceDamageRectBorderWidth(layer_tree_impl());
651        break;
652      case REPLICA_SCREEN_SPACE_RECT_TYPE:
653        stroke_color = DebugColors::ScreenSpaceSurfaceReplicaRectBorderColor();
654        fill_color = DebugColors::ScreenSpaceSurfaceReplicaRectFillColor();
655        stroke_width = DebugColors::ScreenSpaceSurfaceReplicaRectBorderWidth(
656            layer_tree_impl());
657        break;
658      case SCREEN_SPACE_RECT_TYPE:
659        stroke_color = DebugColors::ScreenSpaceLayerRectBorderColor();
660        fill_color = DebugColors::ScreenSpaceLayerRectFillColor();
661        stroke_width =
662            DebugColors::ScreenSpaceLayerRectBorderWidth(layer_tree_impl());
663        break;
664      case OCCLUDING_RECT_TYPE:
665        stroke_color = DebugColors::OccludingRectBorderColor();
666        fill_color = DebugColors::OccludingRectFillColor();
667        stroke_width = DebugColors::OccludingRectBorderWidth(layer_tree_impl());
668        break;
669      case NONOCCLUDING_RECT_TYPE:
670        stroke_color = DebugColors::NonOccludingRectBorderColor();
671        fill_color = DebugColors::NonOccludingRectFillColor();
672        stroke_width =
673            DebugColors::NonOccludingRectBorderWidth(layer_tree_impl());
674        break;
675    }
676
677    const gfx::RectF& rect = debug_rects[i].rect;
678    SkRect sk_rect =
679        SkRect::MakeXYWH(rect.x(), rect.y(), rect.width(), rect.height());
680    paint.setColor(fill_color);
681    paint.setStyle(SkPaint::kFill_Style);
682    canvas->drawRect(sk_rect, paint);
683
684    paint.setColor(stroke_color);
685    paint.setStyle(SkPaint::kStroke_Style);
686    paint.setStrokeWidth(SkFloatToScalar(stroke_width));
687    canvas->drawRect(sk_rect, paint);
688  }
689
690  canvas->restore();
691}
692
693const char* HeadsUpDisplayLayerImpl::LayerTypeAsString() const {
694  return "HeadsUpDisplayLayer";
695}
696
697}  // namespace cc
698